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6. What is the principal focus (diverging lens)?
- Where the axis crosses the lens
- Where rays hitting the lens parallel to the axis appear to come from
- where rays hitting the lens parallel to the axis all seem to meet
7. What is the force that keeps things moving in a circle?
- Earth
- Centripetal
- Velocity
8. What type of lens is use for magnifying glasses?
9. How can you tell something is a real image?
- it can be seen on a TV
- the light can produce an image on the screen
- it can be seen with a magnifying glass
10. What is the principal focus (converging lens)?
- where rays hitting the lens parallel to the axis all seem to meet
- Where the axis crosses the lens
- where the eye focuses
11. Pressure in a liquid is..
- difficult to see
- transmitted equally in all directions
- hard to measure
12. What is the focal length?
- the distance from the centre of the lens to the principal focus
- The distance from each of the principal focuses
- The distance from the eye to the lens
13. What type of lens is used for long sighted people?
- Convex/converging
- Concave/Diverging